Michelle Duggar suffered a devastating miscarriage last December, and on Tuesday's finale of "19 Kids & Counting," Duggar bravely takes viewers inside her final ultrasound session to document the moment when she learned her 20th child was without a heartbeat.

"We were so excited to see the baby again on the ultrasound screen and find out if it was a girl or a boy," Duggar recalls in an exclusive preview clip from Tuesday's episode of the TLC hit. "As we began to look, I could tell by the look on [the ultrasound technician's] face that something wasn't right."

The family -- which includes Joshua (who is married with two kids of his own), twins Jana and John-David; Jill; Jessa; Jinger; Joseph; Josiah; Joy-Anna; twins Jedidiah and Jeremiah; Jason; James; Justin; Jackson; Johanna; Jennifer; and Jordyn and Josie -- mourned the loss of their baby in a private ceremony at their Arkansas home shortly after the fateful day depicted on Tuesday's finale.